docs: add AI-friendly documentation and code comments

Add comprehensive documentation for AI assistants:
- .cursorrules with project context and conventions
- ARCHITECTURE.md with technical details
- DEVELOPMENT.md with practical guides
- JSDoc comments in all JavaScript modules
- Update README.md with AI-Friendly Development section

This enables AI tools (Cursor, Claude Code, GitHub Copilot) to understand the project and generate code following CoreUI Vue patterns.

src/router/index.js

@@ -1,8 +1,36 @@
+/**
+ * router/index.js - Vue Router Configuration
+ *
+ * This file configures the application routing using Vue Router 5.
+ * It defines all routes and navigation structure for the SPA.
+ *
+ * Routing Features:
+ * - Hash-based routing (createWebHashHistory) for static hosting compatibility
+ * - Lazy loading for all route components (code splitting)
+ * - Nested routes for layout-based navigation
+ * - Automatic scroll to top on navigation
+ *
+ * Route Structure:
+ * - Protected routes: Wrapped in DefaultLayout with sidebar and header
+ * - Public routes: Login, Register, 404, 500 pages without layout
+ *
+ * Adding New Routes:
+ * 1. Import component (use dynamic import for code splitting)
+ * 2. Add route object to appropriate section
+ * 3. Update _nav.js for sidebar navigation (if needed)
+ *
+ * @see https://router.vuejs.org/
+ */
+
 import { h, resolveComponent } from 'vue'
 import { createRouter, createWebHashHistory } from 'vue-router'
 
 import DefaultLayout from '@/layouts/DefaultLayout'
 
+/**
+ * Application routes configuration
+ * @type {Array<Object>}
+ */
 const routes = [
   {
     path: '/',